Was fooling around in Delkfutt's and decided to mess around with Holy Circle. After last patch common agreement seemed to state that Circle JAs added +15% Dmg.
http://i280.photobucket.com/albums/k...917_193141.png
This pretty much agrees with what had been said before.
Assuming that Atonement would have done 750 Dmg before Holy Circle...
877 - 750 = 127
127/750 = .169333
I plan on also testing the effect of Gallant Leggings +1 on Holy Circle, and whether or not they increase the damage bonus.
In other words, 16.9% on that specific WS.... Assuming rounding is involved, I'd say 15% is a pretty safe figure to go with.